Definition of "stop"

A cop in the USA was demoted for his actions on a traffic stop.
Based on the information from the statement from the subject
complaint, and the officer's report, the event played out like
this.

A subject male person runs a stop sign and gets pulled over by a
police officer.

Officer says, "License and registration, please."

Subject responds, "What for?"

Officer says, "You didn't come to a complete stop at the stop sign."

Subject responds, "I slowed down, and no one was coming."

Officer says, "You still didn't come to a complete stop.?
License and registration please."

Subject responds, "What's the difference?"

Officer says, "The difference is, you have to come to a complete
stop, ?License and registration, PLEASE!"

Subject responds, "If you can show me the difference between
slowing down and coming to a stop, I'll give you my license
and registration".

Officer says, "Exit your vehicle, sir."

At this point, the officer takes out his nightstick and starts
beating the ever-loving **** out of the subject and says:
"NOW - DO YOU WANT ME TO STOP OR JUST SLOW DOWN?"